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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e41cc7f764702a3b1c8920fcc816eebcc1ea105798a962e302513ff62a9bf900' 
  AND token = '4IB1EtEnP32CVeybjZJ+a+14+2uKlREC5za3I4jMIgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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