Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6f4d7834747e4e486569974aa7f38e0286099e0802837aab2b4e7c1627e8a8' 
  AND token = 'CeH7/REhb7dgATxUydMIaxNebZvg8i1TQ5kk0bEXgEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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