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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ed6c6b6062c58d395f026544ef1891e941d5a79e4ac5c0e7455100864d094def' 
  AND token = '6AcS89IGnfkuYECZlFjFXW3IbNQaVeroxxsBne0mwu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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