Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c6cd827a6b125275c7b7dc7f4d0fa0c42c47814b796ea8931bc352bacd7b4460' 
  AND token = 'r089omt412mSSdo4cR6hNsuI+fB+KfjI8D2vhvNN1fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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