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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4e93cbd2d51e9db7e55b40502b9b489be1bbcf74cb5f5b6e18f3a468c6c9abc2' 
  AND token = 'yYwQw0dnRXMNp9V+5Oi+rE9kCb4FRaE/wRN55X1HYaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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