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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd7d69372537a5e955c7e0652e76d11214f1c7b04a34dbca93715f25cac3a5bb6' 
  AND token = 'EDHk6k/qbpTRDKNf5U+szd/6MnU3Q/wUCkWqDyorFto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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