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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '02dc4fc662ac67c8e0cc9cd2ef6d6e885eb3eafcf32adc032664fc88aba6edbd' 
  AND token = 'jCPATWGn1syKlSPDjbEV7VmBOkQO4F79XwZYZQQTKg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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