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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd25476e56c8ae5f81508a64670c27db85bdf803251f25f439d106aeb42171d12' 
  AND token = 'bnLP9de2xMDAcxgbGgBA7Kcyw8NMWpbY7htlyRf85FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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