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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fdeeae71a0f1482f61674d34740410307b5fefcbe67aef13d9bf93f7ccf63944' 
  AND token = 'lYUiVfVq0UOWUxLPo13pDcGYG2e4cUwqh7CTG00sp8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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