Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a046a9d12b0e1287e4c7dec7fcbbdaeb0165b238b9a370afb9e5f74440b608aa' 
  AND token = '+ld73CPbz1+Oh5IdpJ8E4FLw+Xa+EruNuy14/D6gYrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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