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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '826bc327c052d01333e79b28a4a8860cc22662ccb9f8897bd5b2d164d2ddb2af' 
  AND token = 'JVQftfJkTRbK8Z0/J+gy6KhJOG0OKM2aKK4o/oWdKiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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