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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4aa72f5b24db57baa35a62b45af6dbc4a7bba6f2b255eb33f65bdcfad4a0fde8' 
  AND token = 'afoZb2KBEvfptZ2SpL7DzJLgzfxyM4miS7os8d/ReT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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