Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec14b9ceea8737be8d2034c4c03059b02a9e1eac15277e097d36a1035be627d' 
  AND token = 'obCQtsFt+TY+0OcvW45QE+jVn/SA+E/GgcpFJDpeD74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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