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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '175ffbf67ee78decde796064153d71028b69fedb0776ff2a0bcf444246f25dfb' 
  AND token = 'cqxSmShwOXaCjNnP448ckgxluj/wRrCbWPpDqWte8Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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