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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '16129505f98cf157e69f89a0c6f9c0090f5660b7cc6c2d6f1d928a4a4bd46e1b' 
  AND token = 'yoD2cNf8S2mxsBZc13lLP2cewlgBNwud4c4sJaOoaaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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