Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1f9c4909ffd35d403d38c869ec2444cf39dfcd093a9d04937dbe818cfb3729' 
  AND token = 'KIxgAoYh7OaS3m3VFPpqXhdlCTJojiJnw2GTpRB7iRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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