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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3a7fbe5e4c13f94642a068d454cc483407053f5a96a9b616444495437470c653' 
  AND token = '+KOP4P0ILwE7OQ9/WYRuEq5zWV3woF4rpYb+jwuiNsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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