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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0a7697ed0b3aee91fa24b39d306b4ab56e6589ecb9532ec44010311f3acca168' 
  AND token = '1o1W9bYHofHocQHaZweOsw0AUzzMNp3zpGNjUBvUokE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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