Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b778499c5d3e91ba2136f9e5754f571b02dfaa8c9f43ced909f7d31e1ea4c6' 
  AND token = 'ncc4pdsmCNvaFyBNwPk3v+V0BVN9r9EnYEuxH6E5GeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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