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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8d71dc07ff2869d971d3f6140035865755a096141ec3d2658b74488dcfe130d4' 
  AND token = 'Tk9TxW07H8pS6SKbEUbTV/L83H32P4WDeXnI8zwDSkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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