Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a0108c87dfbe2d371d0590d4964ccb0d941c546836ebc2567950914c41c6ed1' 
  AND token = 'uQJ9XiNDfaQj0u9UboXXecIywKS70WP1pGNWoXbF8hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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