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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ea0e5386dba5b30993281cc462481a7a9a61788146c47c4a8c9bc7ac5c51c1e5' 
  AND token = 'aNiOkD5qmYzQe96TJYq8eqRZKXPfwF1ecXFTlV0yMi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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