Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62971f34cbb03b0b5ceaad4e7b68980b6f3fc1a100a19171dd0c2b0562e8bf02' 
  AND token = 'MndOo9bUIbylb7V4e2fs5bHLTf9XnfmzcnbcFp9d3qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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