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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5ded465f303161d35b0ebda15fb7111d5d524f51aceea6946c1af5bbd3d8ab3f' 
  AND token = 'pv2u6eFC3VjfaRm3HAvwkIXe36BXehsKXGdd8UUgdt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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