Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55918b7a61c613378aef251bf283f5570dcc0f7144aee6addeba083d4897c8e1' 
  AND token = 'a9JOhcvZjZdQFW25k03xyG2/My/1OsFnQREcGgFo58o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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