Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e02b5bb982eed18475eb266949923f1b723bb98a55183eab25e9ae2021d64e' 
  AND token = 'OmMomboWqeOFPr84vzcaGPTs+XoLs+fKyela4pb9JLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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