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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '27294a4428a9d2f8a771033709d64873bad1bf3406fed4b48c323b87a333fe7e' 
  AND token = 'Y7Z1MBKsJ707TTkXYGZ53dEIeD6HNrfyzXLWbjJUCag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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