Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e3852df48294d137664c2c9e8816a17193ed5f945504e882c841ac6ba2de42' 
  AND token = '0E+qzyo4GzLSErjKkcM+oJDGlzRpeTAokzQK/me5N1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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