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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0504e2c54841d1ef6299a3965dc8278bd2b5c0a23773bd9bb9a922f5a95eb29e' 
  AND token = 'WJpeEmqWu+GzqJgjpv1Xadi/Smq1ti2SGVkTyDHRHec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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