Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5dfd6166bdedfcd4be852b50071e109f4075a260ca7ff30613d4483e4934ced' 
  AND token = 'XEgRUVaKMqTSRZZyMD+P56o2n7u0fhvfESqSFmQ2AH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}