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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd125fda6ef881cec83ff444e18c6b70bac3d4c899971ef2460c27d7c07bf7427' 
  AND token = 'MNG7SN/xgsaEbJdK/FksQjufvzl5ut8IfpKTyBoHPR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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