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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '637ba7badf3cf5ae232726943cf2e2c524f0fa92971f153e6db9f64ffe2e89ee' 
  AND token = '4RgCbQu19y9SHGgK8fmHWf7UxqGTgAtBj5I5WQce85Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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