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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5395e249d499c51d5bad12e6f1368fab17aa535bfb26deceb623ae7e19c7fde5' 
  AND token = 'zofLk1gbkYBvg8F/fd+Kt8EgADy2gNxLQ72vFNncPbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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