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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3cdfa190ad74627d36f500882dc88499d4a8c0adefa3c0a53fc47166316d13d2' 
  AND token = '0g58oxNnt33ykhAIxlkLQrbx/l1TCeb+8xxjTMDT4fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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