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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '476b23ac259097afc256a9828f4e03aa8088577eeb4b7d3d56e6e513118cb237' 
  AND token = 'F7M2KSxYbXuysPWYzPriP5Ef/L/QRJanIxoYROaLQDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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