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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a551886fab473cc5a033569b6b4ca0123faf49e7361c193a73b3a33b89d8a7c8' 
  AND token = '58jwHqPDS4HzAaQzP5M+A8ZY1IFat5/D/E3LCa0HRDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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