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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '74af43705ac5a86c79e49561378f29ca33f0f6763dd9628d7391131d4fe0c8c0' 
  AND token = 'Xr3bsVdXvMSaasnCZiVSLjEvptExctqBRq3Fx5f6xzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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