Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb206e02a2a7139d5d6ebdfb16d6b9f2f5df3e302d7aeb85a8b25d615ee4a986' 
  AND token = 'vSYNS6IRlvtVx/UQcQ4vVhQHV4PbuqH44TGZCs4BPW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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