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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '331f8059cf7488adf5aac3039a519bcb13a85ea38b352bffb25b6525ed89fef7' 
  AND token = 'bt/n4eU0Me0Me5ktr6fId0EDhtoL/7WYrj673UX1XHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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