Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309d29d4ef88f55740f218e38540b92c4474d02a89c5b3eb8fd5f377cf962cf2' 
  AND token = 'khFX85zn+QYx2rMHqLrQ1q56NN1EIuPrspiQuvBX7+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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