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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7cc15ea381c11117b27353e0e92565217b0cd199c700dcf82e32dd9ce1e20ea7' 
  AND token = 'rqNfuOcepnIC8HUTyK5Sx5m6ER+d1j0QpI4nIBTHCuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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