Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea893ce7c90faaf2e214b784b71d250d50fa5e439c9aabe4e61e6b689439def9' 
  AND token = 'j3h0vLIyhQ1hCAY9Dk8uOUOPV4aYs16XiNsYtAKajcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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