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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '68fd94177285224f1253338339307aaa35d015cf3ce3654c178403aba7bfa524' 
  AND token = 'LSb6uGB3Tbu+lyNUpiHzBIGZaKQUcT70cHTZdWGcTS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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