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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd2ebb9271c71b75c413e2dc59a8119df0c7d5dfcc0e99b2072cfe3e7538a6879' 
  AND token = 'iyW0w4luW/1yKhtOaDHqrBa6AHWS3jAK84HHwIFcW64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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