Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7662623181cd4dfa2f738f18b3f5a7b71bb272bb3517436b7c1e03aa372d7d26' 
  AND token = 'kFmHJ9rKdj+Eh1CM6ZN4e/RM6Lgwl4LHhF9mRslrLR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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