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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '337a062f24c8652da62987ac6ac174c9be6034a4c3b886307254c590494d5fb1' 
  AND token = 'tDlOC3T3gWfaj2nHglyahQEjqXjFkzA46r8wias/YW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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