Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0eac368aa9d3d5fdeee09dafad0dd3ac2bf5e8b8fd9301113acbfcf5aad6946' 
  AND token = 'n7+ehI/h7O1nXEn1f4F3gCJUVuG95F3SiPCD+V6e8Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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