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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aba2e1946f711d5eeeb602a4fa3edae892b8a7c3d75642d0fe31279a4d610a18' 
  AND token = 'hOCCHRc8fEPBKgETtaCcIzO7m2GyzZzl2mCKfcQ40Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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