SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd7cfec5faf351db21c954b45aaf4255127e957a85032e15024443cd23d8c1ffe' 
  AND token = 'r+q9lSJBNammzDQBB66XJB0hcbK8f+gf4JuznwZ7KW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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