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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd09b0a21d15bdf395bd31380a808330564be14f278001cc9ba801d99ab779eaf' 
  AND token = 'vMHFTwlVfb2L8M0r7qHkkxSwSDIfaGBteS60CS66BZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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