Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e3a8cf77243ae6b3e1a91a4ce59af05fd0b0edc59ebda727acd06f62575896' 
  AND token = '/4NMZWYUojQGlHEFMmPbbyTZKS7E/9Mp1mMcfQYaYM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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