Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea4b249097ca5ad086d360f3701c7359968e4878fa4da8a1e616df9ca72d3ab' 
  AND token = '2bCyK+Wm5j0RLDuCYrLO3NDiSB7jOp6/UUKSvJwSAWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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