Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405b758dbdbe803bddd92f6571422321fc3150b4760dfeebb829874594b746c0' 
  AND token = '2tLkxJ9icEx2N79p+lD1Vpaj6Lw3u6EuqsMcLtr3YT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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