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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a47d66a5023b832143ae4e359d927e556444e3d3871359984ec77d928f3e49e9' 
  AND token = 'LlalkiXq9udzUD44aEw1/z/nCaZ3h3u7rctyhsZ5EFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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